Diesel is not cut with ethanol. Only gasoline is...mainly as a fuel additive that both oxygenates the fuel and boosts octane. I hope you're not using a standard automotive trickle charger, but a smart three-stage marine battery charger. A trickle charger will often over charge the batteries and boil off electrolyte.
As for the odor in the water system. Try shock treating it with chlorine bleach, per Peggy Hall's instructions.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.